74LV245N Просмотр технического описания (PDF) - Philips Electronics
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74LV245N Datasheet PDF : 12 Pages
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Philips Semiconductors
Octal bus transceiver (3-State)
Product specification
74LV245
FEATURES
• Wide operating voltage: 1.0 to 5.5 V
• Optimized for low voltage applications: 1.0 to 3.6 V
• Accepts TTL input levels between VCC = 2.7 V and VCC = 3.6 V
• Typical VOLP (output ground bounce) < 0.8 V at VCC = 3.3 V,
Tamb = 25°C
• Typical VOHV (output VOH undershoot) > 2 V at VCC = 3.3 V,
Tamb = 25°C
• Output capability: bus driver
• ICC category: MSI
DESCRIPTION
The 74LV245 is a low-voltage Si-gate CMOS device and is pin and
function compatible with 74HC/HCT245.
The 74LV245 is an octal transceiver featuring non-inverting 3-State
bus compatible outputs in both send and receive directions. The
74LV245 features an output enable (OE) input for easy cascading
and a send/receive (DIR) input for direction control. OE controls the
outputs so that the buses are effectively isolated.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25°C; tr = tf ≤ 2.5 ns
SYMBOL
PARAMETER
CONDITIONS
tPHL/tPLH
Propagation delay
An to Bn; Bn to An
CL = 15 pF;
VCC = 3.3 V
CI
Input capacitance
CI/O
Input/output capacitance
CPD
Power dissipation capacitance per buffer
VCC = 3.3 V
VI = GND to VCC, note 1
NOTE:
1. CPD is used to determine the dynamic power dissipation (PD in µW)
PD = CPD VCC2 fi )ȍ (CL VCC2 fo) where:
fi = input frequency in MHz; CL = output load capacitance in pF;
fo = output frequency in MHz; VCC = supply voltage in V;
ȍ (CL VCC2 fo) = sum of the outputs.
TYPICAL
7.0
3.5
10
40
UNIT
ns
pF
pF
pF
ORDERING INFORMATION
PACKAGES
20-Pin Plastic DIL
20-Pin Plastic SO
20-Pin Plastic SSOP Type II
20-Pin Plastic TSSOP Type I
TEMPERATURE RANGE OUTSIDE NORTH AMERICA
–40°C to +125°C
74LV245 N
–40°C to +125°C
74LV245 D
–40°C to +125°C
74LV245 DB
–40°C to +125°C
74LV245 PW
NORTH AMERICA
74LV245 N
74LV245 D
74LV245 DB
74LV245PW DH
PKG. DWG. #
SOT146-1
SOT163-1
SOT339-1
SOT360-1
PIN DESCRIPTION
PIN NUMBER SYMBOL
FUNCTION
1
DIR
Direction
2, 3, 4, 5,
6, 7, 8, 9
A0 to A7 Data inputs/outputs
10
GND
Ground (0 V)
18, 17, 16, 15,
14, 13, 12, 11
B0 to B7 Data inputs/outputs
19
OE
Output enable input (active LOW)
20
VCC
Positive supply voltage
FUNCTION TABLE
INPUTS
OE
DIR
L
L
L
H
H
X
NOTES:
H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
INPUTS/OUTPUT
An
A=B
Bn
Inputs
Inputs
B=A
Z
Z
1998 Apr 20
2
853–1931 19258
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